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Missing sequence terms
Use the constant step size between terms to find the missing middle number in a sequence. Review suitability for your learners before teaching.
Worksheet StudioPractice pack · Ages 4-6
Missing sequence terms
Take your time. Show your thinking.
1. Find the missing number in the sequence: 13, 14, ____, 16, 17.
2. Find the missing number in the sequence: 12, 14, ____, 18, 20.
3. Find the missing number in the sequence: 14, 15, ____, 17, 18.
4. Find the missing number in the sequence: 7, 8, ____, 10, 11.
5. Find the missing number in the sequence: 4, 5, ____, 7, 8.
6. Find the missing number in the sequence: 4, 9, ____, 19, 24.
7. Find the missing number in the sequence: 8, 13, ____, 23, 28.
8. Find the missing number in the sequence: 10, 15, ____, 25, 30.
9. Find the missing number in the sequence: 6, 7, ____, 9, 10.
10. Find the missing number in the sequence: 11, 13, ____, 17, 19.
11. Find the missing number in the sequence: 3, 8, ____, 18, 23.
12. Find the missing number in the sequence: 9, 11, ____, 15, 17.
12 questions · Seed 55 · Age guidance, not curriculum certification
View the answer key
Worksheet StudioAnswer key · Ages 4-6
Missing sequence terms
Answers and reasoning. Review before teaching.
1. Find the missing number in the sequence: 13, 14, ____, 16, 17.
15The sequence increases by 1 each step: 14 + 1 = 15.
2. Find the missing number in the sequence: 12, 14, ____, 18, 20.
16The sequence increases by 2 each step: 14 + 2 = 16.
3. Find the missing number in the sequence: 14, 15, ____, 17, 18.
16The sequence increases by 1 each step: 15 + 1 = 16.
4. Find the missing number in the sequence: 7, 8, ____, 10, 11.
9The sequence increases by 1 each step: 8 + 1 = 9.
5. Find the missing number in the sequence: 4, 5, ____, 7, 8.
6The sequence increases by 1 each step: 5 + 1 = 6.
6. Find the missing number in the sequence: 4, 9, ____, 19, 24.
14The sequence increases by 5 each step: 9 + 5 = 14.
7. Find the missing number in the sequence: 8, 13, ____, 23, 28.
18The sequence increases by 5 each step: 13 + 5 = 18.
8. Find the missing number in the sequence: 10, 15, ____, 25, 30.
20The sequence increases by 5 each step: 15 + 5 = 20.
9. Find the missing number in the sequence: 6, 7, ____, 9, 10.
8The sequence increases by 1 each step: 7 + 1 = 8.
10. Find the missing number in the sequence: 11, 13, ____, 17, 19.
15The sequence increases by 2 each step: 13 + 2 = 15.
11. Find the missing number in the sequence: 3, 8, ____, 18, 23.
13The sequence increases by 5 each step: 8 + 5 = 13.
12. Find the missing number in the sequence: 9, 11, ____, 15, 17.
13The sequence increases by 2 each step: 11 + 2 = 13.
12 questions · Seed 55 · Age guidance, not curriculum certification
Worksheet StudioPractice pack · Ages 4-6
Missing sequence terms
Take your time. Show your thinking.
1. Find the missing number in the sequence: 13, 14, ____, 16, 17.
2. Find the missing number in the sequence: 12, 14, ____, 18, 20.
3. Find the missing number in the sequence: 14, 15, ____, 17, 18.
4. Find the missing number in the sequence: 7, 8, ____, 10, 11.
5. Find the missing number in the sequence: 4, 5, ____, 7, 8.
6. Find the missing number in the sequence: 4, 9, ____, 19, 24.
7. Find the missing number in the sequence: 8, 13, ____, 23, 28.
8. Find the missing number in the sequence: 10, 15, ____, 25, 30.
9. Find the missing number in the sequence: 6, 7, ____, 9, 10.
10. Find the missing number in the sequence: 11, 13, ____, 17, 19.
11. Find the missing number in the sequence: 3, 8, ____, 18, 23.
12. Find the missing number in the sequence: 9, 11, ____, 15, 17.
12 questions · Seed 55 · Age guidance, not curriculum certification
Worksheet StudioAnswer key · Ages 4-6
Missing sequence terms
Answers and reasoning. Review before teaching.
1. Find the missing number in the sequence: 13, 14, ____, 16, 17.
15The sequence increases by 1 each step: 14 + 1 = 15.
2. Find the missing number in the sequence: 12, 14, ____, 18, 20.
16The sequence increases by 2 each step: 14 + 2 = 16.
3. Find the missing number in the sequence: 14, 15, ____, 17, 18.
16The sequence increases by 1 each step: 15 + 1 = 16.
4. Find the missing number in the sequence: 7, 8, ____, 10, 11.
9The sequence increases by 1 each step: 8 + 1 = 9.
5. Find the missing number in the sequence: 4, 5, ____, 7, 8.
6The sequence increases by 1 each step: 5 + 1 = 6.
6. Find the missing number in the sequence: 4, 9, ____, 19, 24.
14The sequence increases by 5 each step: 9 + 5 = 14.
7. Find the missing number in the sequence: 8, 13, ____, 23, 28.
18The sequence increases by 5 each step: 13 + 5 = 18.
8. Find the missing number in the sequence: 10, 15, ____, 25, 30.
20The sequence increases by 5 each step: 15 + 5 = 20.
9. Find the missing number in the sequence: 6, 7, ____, 9, 10.
8The sequence increases by 1 each step: 7 + 1 = 8.
10. Find the missing number in the sequence: 11, 13, ____, 17, 19.
15The sequence increases by 2 each step: 13 + 2 = 15.
11. Find the missing number in the sequence: 3, 8, ____, 18, 23.
13The sequence increases by 5 each step: 8 + 5 = 13.
12. Find the missing number in the sequence: 9, 11, ____, 15, 17.
13The sequence increases by 2 each step: 11 + 2 = 13.
12 questions · Seed 55 · Age guidance, not curriculum certification